The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

graphical.target @53.979s
└─multi-user.target @53.978s
  └─teamviewerd.service @48.829s +5.147s
    └─network-online.target @48.761s
      └─NetworkManager-wait-online.service @32.450s +16.308s
        └─NetworkManager.service @20.778s +11.662s
          └─dbus.service @20.767s
            └─basic.target @20.595s
              └─sockets.target @20.595s
                └─snapd.socket @20.586s +7ms
                  └─sysinit.target @20.304s
                    └─snapd.apparmor.service @19.505s +797ms
                      └─apparmor.service @17.811s +1.660s
                        └─local-fs.target @17.809s
                          └─run-user-1000.mount @41.776s
                            └─swap.target @16.801s
                              └─dev-zram1.swap @23.508s
                                └─dev-zram1.device @22.926s